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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F720-E/ML датащи(PDF) 165 Page - Microchip Technology |
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PIC16F720-E/ML датащи(HTML) 165 Page - Microchip Technology |
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165 / 244 page  2010 Microchip Technology Inc. DS41430A-page 165 PIC16F/LF720/721 EXAMPLE 18-2: WRITING TO FLASH PROGRAM MEMORY ; This write routine assumes the following: ; 1. A valid starting address (the least significant bits = ‘00000’)is loaded in ADDRH:ADDRL ; 2. The 64 bytes of data are loaded, starting at the address in DATADDR ; 3. ADDRH, ADDRL and DATADDR are all located in shared data memory 0x70 - 0x7f ; BANKSEL PMADRH ; Bank 3 MOVF ADDRH,W ; Load initial address MOVWF PMADRH ; MOVF ADDRL,W ; MOVWF PMADRL ; MOVF DATAADDRL,W ; Load initial data address MOVWF FSR0L ; MOVF DATAADDRH,W ; Load initial data address MOVWF FSR0H ; LOOP MOVIW INDF0++ ; Load first data byte into lower MOVWF PMDATL ; MOVIW INDF0++ ; Load second data byte into upper MOVWF PMDATH ; BSF PMCON1,WREN ; Enable writes BSF PMCON1,LWLO ; Only Load Write Latches MOVLW 55h ; Start of required write sequence: MOVWF PMCON2 ; Write 55h MOVLW AAh ; MOVWF PMCON2 ; Write AAh BSF PMCON1,WR ; Set WR bit to begin write NOP ; Any instructions here are ignored as processor ; halts to begin write sequence NOP ; processor will stop here and wait for write complete ; after write processor continues with 3rd instruction MOVF PMADR,W ; Check if lower five bits of address are ‘11111’ XORLW 0x1F ; Check if we’re on the last of 8 addresses ANDLW 0x1F ; BTFSC STATUS,Z ; Exit if last of 32 words, GOTO START_WRITE ; INCF PMADR,F ; Still loading latches Increment address GOTO LOOP ; Write next latches START_WRITE BCF PMCON1,LWLO ; No more Latches only; Actually start write MOVLW 55h ; Start of required write sequence: MOVWF PMCON2 ; Write 55h MOVLW AAh ; MOVWF PMCON2 ; Write AAh BSF PMCON1,WR ; Set WR bit to begin write NOP ; Any instructions here are ignored as processor ; halts to begin write sequence NOP ; processor will stop here and wait for write complete ; after write processor continues with 3rd instruction BCF PMCON1,WREN ; Disable writes |
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